Working sound system and most enemies have a sound effect. This will make it easier to add sounds now.

meson.build

@@ -79,6 +79,7 @@ sources = [
   'render.cpp',
   'save.cpp',
   'shiterator.hpp',
+  'sound.cpp',
   'spatialmap.cpp',
   'stats.cpp',
   'status_ui.cpp',
@@ -104,6 +105,7 @@ executable('runtests', sources + [
   'tests/map.cpp',
   'tests/matrix.cpp',
   'tests/pathing.cpp',
+  'tests/sound.cpp',
   'tests/spatialmap.cpp',
   'tests/textures.cpp',
   'tests/tilemap.cpp',